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authorMathieu Desnoyers <mathieu.desnoyers@efficios.com>2020-07-06 10:21:31 +0200
committerFlorian Weimer <fweimer@redhat.com>2020-07-06 10:21:32 +0200
commit6e29cb3f61ff5432c78a1c84b0d9b123a350ab36 (patch)
tree64123a1c9f0e8b7e6ef41f9910449065c6942022 /sysdeps/unix/sysv/linux/alpha
parent0c76fc3c2b346dc5401dc055d97d4279632b0fb3 (diff)
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Linux: Use rseq in sched_getcpu if available
When available, use the cpu_id field from __rseq_abi on Linux to
implement sched_getcpu().  Fall-back on the vgetcpu vDSO if unavailable.

Benchmarks:

x86-64: Intel E5-2630 v3@2.40GHz, 16-core, hyperthreading

glibc sched_getcpu():                     13.7 ns (baseline)
glibc sched_getcpu() using rseq:           2.5 ns (speedup:  5.5x)
inline load cpuid from __rseq_abi TLS:     0.8 ns (speedup: 17.1x)
Diffstat (limited to 'sysdeps/unix/sysv/linux/alpha')
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